Families of victims of the deadliest U.S. air disaster in nearly 25 years visited the crash site just outside Washington, D

Almost a week after a helicopter and airplane collision in Washington killed 67 people, investigators are still at work as salvage crews pull out chunks of aircraft.

The wreckage of the American Airlines jet that collided with an Army Black Hawk helicopter will begin being removed from the Potomac River on Monday. Authorities have recovered and identified 55 of the 67 people killed in the crash.